CN101509405A - Valve structure of internal combustion engine - Google Patents
Valve structure of internal combustion engine Download PDFInfo
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- CN101509405A CN101509405A CNA2009100038991A CN200910003899A CN101509405A CN 101509405 A CN101509405 A CN 101509405A CN A2009100038991 A CNA2009100038991 A CN A2009100038991A CN 200910003899 A CN200910003899 A CN 200910003899A CN 101509405 A CN101509405 A CN 101509405A
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Abstract
The invention claims a valve structure of an internal combustion engine which can compactly arrange a water pump in a camshaft having a decompressing device in order to realize the miniaturization of cylinder cover. The valve structure includes a camshaft (53), an engine valve (56e) that opens or closes by a valve cam arranged in the camshaft, and a decompressing device (100), a decompressing counterweight (101) of the decompressing cam (105) coming in and going out a cam surface of the valve cam (53e) can be shaft-supported in an end portion or in the vicinity of an end portion of the camshaft (53) in an oscillating way; a water pump (120) is arranged in an end portion of the camshaft (53) in the opposite side of the decompressing counterweight (101) in the axial direction.
Description
Technical field
The present invention relates to a kind of valve structure that possesses decompressor of internal-combustion engine.
Background technique
Example with following configuration, make intake valve and exhaust valve carry out on the camshaft of on-off action decompressor being installed, and, make pump live axle with the camshaft coaxial and together rotation (for example, with reference to patent documentation 1) of cooling water at required circuit water pump of internal-combustion engine.
Patent documentation 1:(Japan) spy opens communique 2005-No. 307840
Disclosed valve structure is fixed with the cam sprocket wheel in the end of camshaft in this patent documentation 1, and the rotation of bent axle is transmitted to the cam chain sprocket wheel via cam chain, thus the camshaft rotation.
And, in position, be aligned in sequence with the decompression counterweight and the water pump of decompressor with camshaft cam sprocket wheel prolongation axially.
Like this, because at the axle direction of camshaft,, be arranged in order and dispose decompression counterweight and water pump at homonymy with respect to the cam sprocket wheel, so, the decompression counterweight and the water pump of swing are adjacent, therefore, and for fear of interference each other, need axle direction to be spaced from each other at interval, therefore, the axial width of accommodating the cylinder head of camshaft becomes big, and cylinder head is maximized.
Summary of the invention
The present invention finishes in view of the above problems, and its purpose is to provide a kind of valve structure of internal-combustion engine, and it can set water pump compactly possessing on the camshaft of decompressor, realize the miniaturization of cylinder head.
To achieve these goals, first aspect present invention provides a kind of valve structure of internal-combustion engine, and it possesses: the camshaft that the rotation of bent axle is driven in rotation via the cam chain transmission; Carry out the engine valve of on-off action by the valve cam that is arranged at this camshaft; During compression stroke during startup, the decompressor that described engine valve is opened, wherein, make camming surface at described valve cam haunt relief cam action freely the decompression counterweight by centrifugal force swingably axle be supported near the end or an end of described camshaft, set water pump in the end of the described camshaft of axle direction and described decompression counterweight opposition side.
Second aspect present invention is on the basis of first aspect, the valve structure of internal-combustion engine is provided, it is characterized in that, described decompression counterweight along in the described valve cam along the side of exhaust cam swingably by the supporting of supporting axle single armed axle, described decompression counterweight be held and be positioned at and the packing ring and described exhaust cam of the block bearing butt of described camshaft between.
Third aspect present invention first or the basis of second aspect on, the valve structure of internal-combustion engine is provided, it is characterized in that described decompression counterweight is disposed in the fabric width of the cylinder sleeve on the axle direction of described camshaft.
Fourth aspect present invention provides the valve structure of internal-combustion engine on the basis of first～third aspect, wherein, described decompression counterweight clamping cylinder axis is at the opposition side of cam sprocket wheel and in the front-end configuration of inserting logical direction of described camshaft.
Fifth aspect present invention provides the valve structure of internal-combustion engine on the basis of first～fourth aspect, it is characterized in that, described water pump rotate the sidewall that the pump housing cylindraceous was embedded into and was supported on cylinder head that makes of ground axle suspension pump live axle freely via bearing.
Valve structure according to the described internal-combustion engine of first aspect, end at axle direction and the camshaft of decompression counterweight opposition side sets water pump, therefore, the decompression counterweight and the water pump of swing are positioned at side opposite each other at axle direction, need not consider each other interference and devices spaced apart, therefore, water pump can be equipped on camshaft compactly and realize the miniaturization of cylinder head.
Valve structure according to the described internal-combustion engine of second aspect, the decompression counterweight is by the side quilt swingably single armed axle supporting of supporting axle along exhaust cam, therefore, shaft supporting part when not needing the supporting of two arm axles, can be with axle direction width compactness, and, the decompression counterweight be held and be positioned at and the packing ring and exhaust cam of the block bearing butt of camshaft between, therefore, can prevent to reduce pressure rocking of counterweight and the action of keeping decompressor well.
According to the valve structure of the described internal-combustion engine of the third aspect, the decompression counterweight is disposed in the fabric width of the cylinder sleeve on the axle direction of camshaft, therefore, can realize the miniaturization of cylinder head.
According to the valve structure of the described internal-combustion engine of fourth aspect, therefore decompression counterweight clamping cylinder axis, can improve the assembling performance of camshaft at the opposition side of cam sprocket wheel and in the front-end configuration of inserting logical direction of described camshaft.
Valve structure according to the described internal-combustion engine in the 5th aspect, the pump housing of water pump can make and be used for via bearing the pump live axle being rotated the cylindric of ground axle suspension freely and realizing miniaturization, and this pump housing cylindraceous is embedded into and is supported on the sidewall of cylinder head, therefore, water pump can be installed on cylinder head compactly.
Description of drawings
Fig. 1 is the unitary side view of the steamboat type motorcycle of an embodiment of the present invention;
Fig. 2 is the unitary side view of power unit;
Fig. 3 is the whole plan view with power unit;
Fig. 4 is the sectional drawing (IV of Fig. 3-IV line sectional drawing) of internal-combustion engine;
Fig. 5 is the sectional drawing (V of Fig. 2-V line sectional drawing) of power unit;
Fig. 6 is the sectional drawing (VI of Fig. 2-VI line sectional drawing) with power unit;
Fig. 7 is the interior valve structure of cylinder head and the plan view of water pump;
Fig. 8 is same sectional drawing;
Fig. 9 is the side view of decompressor;
Figure 10 is the left side view of the same decompressor under other state;
Figure 11 is the left side view of water pump;
Figure 12 is the right side view with water pump.
Description of symbols
20 power units, 30 internal-combustion engines, 31 crankcases, 32 cylinder blocks, 33 cylinder heads, 34 cylinder head covers, 40 bent axles
50 valve mechanisms, 51 cam chains cam chain chambers 52,53 camshafts, 54 inverted cam sprocket wheel 55a cam chain driving sprocket wheel 56e exhaust valve 56i intake valves, 58 intake rocker 58r rollers, 60 exhaust rocker arm 60r rollers
100 decompressors, 101 decompression counterweights, 102 supporting axles, 104 action pins, 105 relief cams, 107 force application mechanisms, 108 packing rings
120 water pumps, the 121 water pump body 121a long cylinder 121b of portion short cylinder portions, 122 water pump covers, 123 water pump live axles, 124 impellers, 125 bearings, 128 seal ring parts
Embodiment
Below, based on Fig. 1～Figure 12 one embodiment of the present invention is described.
Fig. 1 is a side view of having used the steamboat type motorcycle 1 of one embodiment of the present invention.
Promptly, managing the 3 head pipes 2 from Vehicular body front 1f down extends downwards, this time pipe 3 bends to level and at the lower direction rear extension of tread portion 1c in the lower end, link pairing left and right in its back-end and be responsible for 4, the person in charge 4 erects and bends to level at the height of stipulating to oblique rear from this linking department and also rearward extends.
Be responsible for 4 supporting fuel casees 5 etc. by this, and dispose seat 6 above it.
On the other hand, at Vehicular body front 1f, 2 supportings of handgrip 11 head of a quilt pipes also are arranged at the top, and front fork 12 extends downwards and supports front-wheel 13 at its lower end axle.
Outstandingly near the central authorities of 4 rake be provided with support 15 being responsible for, on this support 15, link swingably and support power unit 20 via linkage component.
Erect at the rear portion of the power unit 20 that this reducing gear 38 is arranged between the support 39 that is provided with and the above-mentioned person in charge's 4 rear portion rear shock absorber 22 is installed.
Be Fig. 2 and be Fig. 3 with reference to the side view of power unit 20 with plan view, top at power unit 20, suction tude 23 is extended from the top of the cylinder head that leans forward significantly 33 of internal-combustion engine 30 and is rearward crooked, the throttle body 25 that is connected with this suction tude 23 is positioned at the top of cylinder block 32, is equipped on the top of the inorganic speed changer 46 of belt via the air-strainer 26 of connecting pipe 23c and 25 bindings of this throttle body.
In addition, sparger 24 towards tuned port injection fuel is installed on suction tude 23.
On the other hand, the outlet pipe 27 that extends downwards from the bottom of cylinder head 33 is rearward crooked also is partial to the right side and rearward extends, and is connected with the silencing apparatus (not shown) on the right side of trailing wheel 21.
Tread portion 1c is covered by side cover 9e, and in addition, rear vehicle 1r is covered from side, the left and right sides by vehicle body cover 10.
Fig. 4 is the sectional drawing (IV of Fig. 3-IV line sectional drawing) of internal-combustion engine 30, and Fig. 5 is the sectional drawing (V of Fig. 2-V line sectional drawing) of power unit 20.
On the internal-combustion engine 30, the piston 42 that connecting rod 43 will move back and forth in the cylinder sleeve 44 of cylinder block 32 and the crankpin 40a of bent axle 40 link.
Crankcase 31 is fit and constitute by the left crankcase 31L that divides right and left and right crankcase 31R, right crankcase 31R becomes the halfbody of crankcase portion, its front portion of left crankcase 31L becomes the halfbody of crankcase portion, and bulging rearward and double as is accommodated the transmission case of rectangular variable v-belt drive 46 in front and back.
The rectangular left side open surface in the front and back of this left crankcase (transmission case) 31L is covered by transmission case cover 36, and forms the inner speed change chamber 46C of variable v-belt drive 46 that accommodates, and the right side open surface at rear portion is covered by reduction-gear housing 37, and reducing gear 38 is accommodated in inside.
With reference to Fig. 5 and Fig. 6, in the front portion and the fit so-called crankcase that constitutes of right crankcase 31R of left crankcase 31L, main bearing 41,41 about bent axle 40 is rotatably freely supported on, right extension part in the extension part of substantially horizontal extension to the left and right is provided with cam chain driving sprocket wheel 55a, oil pump actuation gear 55b and AC generator 72, is provided with the governor weight 47 and the driving pulley 48a of variable v-belt drive 46 at left extension part.
Variable v-belt drive 46 hangs V-type band 49 and comes transferring power on the driven pulley 48b of driving pulley 48a and the input shaft 38a that is arranged at reducing gear 38, gear ratio is hung radius by the governor weight mobile according to firing the machine rotating speed 47 changes at the volume of the V-type band 49 of driving pulley 48a, simultaneously, hang radius by the volume that changes driven pulley 48b and automatically change, carry out stepless change.
The rotation of driven pulley 48b passes to the input shaft 38a of reducing gear 38 via centrifugal clutch 35.
Reducing gear 38 is constituting gear engagement by gear mechanism respectively between input shaft 38a and jack shaft 38b and between jack shaft 38b and rear axle shaft 21a, with the rotational delay of input shaft 38a and pass to rear axle shaft 21a, drives trailing wheel 21 rotations.
With reference to Fig. 5 and Fig. 6, the front portion of transmission case cover 36 is formed with recessed to the inside preceding par 36af, the part relative with driving pulley 48a of this preceding par 36af forms cooling air introducing port 36i, the rotation of the cooling fan 48F that the left surface of the fixed pulley half in the left side by driving pulley 48a is provided with can import air to speed change chamber 46C from cooling air introducing port 36i.
Recessed preceding par 36af at this transmission case cover 36 is embedded with pipeline cover 91, and with the mode installation side cover 92 from this pipeline cover 91 of outer side covers.
On pipeline cover 91, be formed with the cooling air introducing port 91i that links with the cooling air introducing port 36i of transmission case cover 36, simultaneously, be formed with skylight 91L on top.
As shown in Figure 6, between the preceding par 36af of the skylight 91L at the rear, top of pipeline cover 91 and transmission case cover 36, be formed with space 96, these 96 its tops, space are shown in the plan view of Fig. 3, become the outer conductance inlet 95 that mode that end face with the perisporium 92b of side cover 92 is cut into rectangular rectangle forms, and and external communications.
Internal-combustion engine 30 running and be arranged at the cooling fan 48F of driving pulley 48a and bent axle 40 when rotating together, cooling air flows shown in dotted arrow among Fig. 6, at first, cooling air imports space 96 from outer conductance inlet 95, from the space 96 by pipeline cover 91 skylight 91L flow ipe cover 91 and the outer conductance of 92 on side cover go into space 97, import air guiding wall 91d and import speed change chamber 46C sleekly from cooling air introducing port 36i, 91i, thus cooling variable v-belt drive 46.
With reference to Fig. 5 and Fig. 6, the sidewall in the cam chain chamber 52 that constitutes right crankcase 31R has big opening, and this opening stops up by the next door 70 that utilizes bolt 17 to install from right-hand, and bent axle 40 connects the cylindrical part 70a in next door 70.
Via ACG wheel hub 73 fixing bowl-shape external rotors 74, the inner stator 76 that is wound with stator coil 77 in the inboard that its side face spreads all over the magnet 75 that circumferencial direction sets is fixed in the cylindrical part 70a in next door 70 to AC generator 72 in the right part of the bent axle 40 of the cylindrical part 70a that connects next door 70.
Right flank at external rotor 74 is equipped with central bulging and becomes discoideus fan substrate 78a, to right-hand tab-like one-tenth a plurality of radiator fans 78 is arranged on fan substrate 78a.
The periphery of the external rotor 74 of AC generator 72 is roughly centered on to the perisporium 31Rs of right-hand extension by the sidewall from right crankcase 31R, the periphery of radiator fan 78 centers on by cover 90, right-hand closing at radiator fan 78 is provided with radiator 80, and radiator 80 is covered by the heat dissipating housing 81 in band skylight.
With reference to Fig. 6, pump live axle 62 has been set up in rotation freely between right crankcase 31R and next door 70, and is provided with oil pump 61, is embedded in the driven gear 63 of pump live axle 62 and the oil pump actuation gear 55b engagement integrally formed with above-mentioned cam chain driving sprocket wheel 55a.
On the right crankcase 31R, oily path 64a extends to downside from oil pump 61, and level oil path 64b extends horizontally to left crankcase 31L to the left from the way of this oil path 64a, and arrive intercalation oil purifier 65 expansion the insert opening 64c of diameter.
The below of level oil path 64b becomes oil and accumulates groove 64e, and the roof that accumulates groove 64e at oil is formed with the otch 64d that is communicated in insert opening 64c.
At the opening of insert opening 64c, fuel feeding tube 66 links that it is open-ended and be provided with.
Be embedded in the opening of embedding hole 64c by the level tube 66a of portion of fuel feeding tube 66, the helical spring 65s one end of being located at the periphery of oil purifier 65 week is limited, the open end of level oil path 64b is pushed and be fixed on to the other end with the flange of the open end of oil purifier 65, prevents to produce the gap.
The 66c of upper end open portion that some footpaths of the inclination tube 66b of portion of fuel feeding tube 66 significantly enlarge becomes oil-feed port, the chimeric filler cap 68 of opening portion 66c screw thread in the top, and can no leakage ground with fuel feeding path 67 obturations.
At the outstanding oil meter 69 that extends in fuel feeding path 67 that is provided with on the filler cap 68, the measurement section of the front end of oil meter 69 is submerged under pasta, and in measurement section mark oil mass.
If filler cap 68 is unloaded, just the oil-feed port of lubricant oil from fuel feeding tube 66 can be supplied in the crankcase 31.
When the rotation that utilizes bent axle 40 drives oil pump 61 via the engagement of actuation gear 55b and driven gear 63, lodge in the oil that oil accumulates groove 65e and be cleaned and extract, be supplied to the needed position of internal-combustion engine 30 from oil pump 61 by oil purifier 65.
This quartastroke engine 30 adopts the valve system of SOHC pattern, valve mechanism 50 is set in cylinder head cover 34, set up the cam chain 51 that oriented this valve mechanism 50 carries out transmission of power between camshaft 53 and bent axle 40, the cam chain chamber 52 that is used for this is communicated with setting (with reference to Fig. 5) with right crankcase 31R, cylinder block 32, cylinder head 33.
That is, and point to the chimeric inverted cam sprocket wheel 54 of the right-hand member of camshaft 53 of left and right horizontal direction and and the chimeric above-mentioned driving cam sprocket wheel 55a of bent axle 40 between, be provided with cam chain 51 by cam chain chamber 52 internal frames.
On the other hand, on cylinder head 33, towards firing chamber 33a intercalation spark plug 45 (with reference to Fig. 2, Fig. 5) is arranged from the opposition side (left side) of cam chain chamber 52.
In addition, at the same left surface of cylinder block 32, spark coil 29 (with reference to Fig. 2, Fig. 3) is installed via supporting bracket 28.
With reference to Fig. 4, suction port 33j is from the firing chamber 33a of the cylinder head 33 that leans forward significantly bending extension upward, and links with above-mentioned suction tude 23, and relief opening 33e links with above-mentioned outlet pipe 26 from firing chamber 33a bending extension downwards.
As shown in Figure 4, valve mechanism 50 in the cylinder head cover 34 leans forward cylinder significantly near horizontal state, therefore, the intake valve 56i that suction port 33i is opened and closed to the opening of firing chamber 33a is equipped on the top of camshaft 53, and the exhaust valve 56e that relief opening 33e is opened and closed to the opening of firing chamber 33a is equipped on the below of camshaft 53.
As shown in Figure 4, be set up in pitman arm shaft 59 with pitman arm shaft 57 and exhaust between Fig. 7 and left and right sides camshaft holder 53h1,53hr shown in Figure 8 in the air inlet that the oblique upper-lower position in the place ahead of camshaft 53 disposes respectively.
Camshaft holder 53h1,53hr are attached at crankcase 31 on (with reference to Fig. 7) by 111 pairs of screwing togather of four stud bolts 110 of each nut by one with cylinder head 33, cylinder block 32.
Air inlet is positioned at upper-lower position with pitman arm shaft 57 and exhaust each other with pitman arm shaft 59, join the end of adjusting screw 58s that screws togather with the other end and the valve rod of intake valve 56i join (with reference to Fig. 4) swinging pivot suspension freely with the roller 58r of the end axle supporting of the intake rocker 58 of pitman arm shaft 57 and the intake cam 53i of camshaft 53 in the air inlet of upside.
Equally, join the end of adjustment screw 60s that screws togather with the other end and the valve rod of exhaust valve 56e join (with reference to Fig. 4) swinging pivot suspension freely with the roller 60r of the end axle supporting of the exhaust rocker arm 60 of pitman arm shaft 59 and the exhaust cam 53e of camshaft 53 in the exhaust of downside.
Therefore, by the rotation of camshaft 53, intake cam 53i and exhaust cam 53e make intake rocker 58 and exhaust rocker arm 60 swings respectively, carry out the on-off action of intake valve 56i and exhaust valve 56e with the moment of regulation.
In this valve mechanism 50, decompressor 100 is arranged on the camshaft 53.
With reference to Fig. 8, decompressor 100 is between the exhaust cam 53e of the left side bearing 53b of the left part of axle supporting camshaft 53 and camshaft 53, with the side of exhaust cam 53e be connected to clamping between the packing ring 108 of left side bearing 53b and the decompression counterweight 101 single armed axles of location are supported on the outstanding supporting axle 102 that is provided with at exhaust cam 53e, and be provided with freely along the side wobble of exhaust cam 53e, move by the outstanding action pin 104 that is arranged at decompression counterweight 101 at the camming surface of the exhaust cam 53e relief cam 105 that rotates freely that haunts.
Fig. 9 and Figure 10 are the left side views of major component being extracted out expression for the action that decompressor 100 is described, and Fig. 9 represents that camshaft 53 stops or the state during low speed rotation, the state when Figure 10 represents that camshaft 53 surpasses the regulation rotational speed.
In addition, in the side of exhaust cam 53e, at the regulation position digging circular hole of cam minor diameter part, and 105 rotations of columned relief cam are chimeric freely, and the part of this relief cam 105 can be chimeric highlightedly from the camming surface of the cam minor diameter part of exhaust cam 53e.
This relief cam 105 forms long elongated slot 105a on the direction of footpath at the left surface of decompression counterweight 101 sides, insert and be sticked in same elongated slot 105a at the above-mentioned decompression counterweight 101 outstanding action pins that are provided with 104, therefore, by the swing of decompression counterweight 101, with the action pin 104 of decompression counterweight 101 one by relief cam 105 being rotated with engaging of elongated slot 105a.
In addition, right flank at this relief cam 105 is formed with otch 105b, rotation by relief cam 105, otch 105b is not when camming surface, relief cam 105 is from the camming surface outstanding (with reference to Fig. 9) of exhaust cam 53e, otch 105b is when camming surface, and relief cam 105 is compared with otch 105b, not from camming surface outstanding (with reference to Figure 10).
At present, when the internal-combustion engine rotational speed when internal-combustion engine 30 starts is low speed, camshaft 53 is low speed rotation also, as shown in Figure 9, little by the swing that the centrifugal force of decompression counterweight 101 produces, be positioned near the camshaft 53 by the decompression counterweight 101 of the application of force by force application mechanism 107, the outstanding action pin 104 that is arranged at decompression counterweight 101 makes relief cam 105 be positioned at otch 105b not towards the position of camming surface, therefore, relief cam 105 is in from the outstanding state of the camming surface of exhaust cam 53e, thus, during compression stroke, from the outstanding relief cam 105 of camming surface the roller 60r of exhaust rocker arm 60 is pushed up up (state shown in Figure 9), 56e opens with exhaust valve, can reduce compression pressure and makes and start easily.
After internal-combustion engine 30 starts, when combustion machine rotating speed rises, camshaft 53 also surpasses the regulation rotating speed, as shown in figure 10, the swing that is produced by the centrifugal force of decompression counterweight 101 is big, decompression counterweight 101 overcomes force application mechanism 107 and swings in the direction of leaving from camshaft 53, action pin 104 makes relief cam 105 in the rotated position of otch 105b towards camming surface, relief cam 105 becomes not from the outstanding state of the camming surface of exhaust cam 53e by otch 105b, therefore, during compression stroke, the roller 60r of exhaust rocker arm 60 is not pushed up up (state shown in Figure 10) yet, exhaust valve 56e also can close valve, becomes the decompression relieving state.
This decompressor utilizes the side swingably single armed axle supporting decompression counterweight 101 of supporting axle 102 along exhaust cam 53e, therefore, the shaft supporting part of a side when not needing the supporting of two arm axles, can be with axle direction width compactness, and since decompression counterweight 101 be held and be positioned and the packing ring 108 and exhaust cam 53e of the block bearing 53b butt of camshaft 53 between, therefore, can prevent from the to reduce pressure action of rocking and keep well decompressor 100 of counterweight 101.
With reference to Fig. 8, the decompression counterweight 101 be equipped on left cam axle bed 53h1 under, the axle direction that is configured in camshaft 53 is in the left and right sides width of the cylinder sleeve on the left and right directions.
Therefore, can suppress the left and right sides width of gas cylinder head 33 and realize miniaturization.
Above decompressor 100 is arranged near the left end of camshaft 53, and is relative with it, and inverted cam sprocket wheel 54 is fixed on the right part of camshaft 53 by bolt 109, and is provided with water pump 120 (with reference to Fig. 7, Fig. 8) at the more right side of camshaft 53 extending portion.
With reference to Fig. 8, camshaft 53 is inserted logical as shown by arrows towards the left side from the right side, inserts the forward end of logical direction from this camshaft and arranges decompression counterweight 101, exhaust cam 53e, intake cam 53i, inverted cam sprocket wheel 54 in order.
Right flank at cylinder head 33 forms round opening, and at the chimeric seal ring parts 128 that ring-type is arranged of together round opening, the formation of water pump 120 pump housing cylindraceous 121 watertight ground embed and also are supported on sealing coil component 128.
With reference to Fig. 8 and Figure 11, Figure 12, the pump housing 121 of water pump 120 is made of 121a of long cylinder portion and the 121b of short cylinder portion, wherein the 121a of long cylinder portion pump live axle 123 is rotated by bearing 125 on the axle direction of ground axle suspension freely long, the 121b of short cylinder portion extends one opening end radius vector direction, and the footpath direction of accommodating the impeller 124 that is embedded in water pump live axle 123 in the part enlarges, short on axle direction, the 121a of long cylinder portion is set to water pump live axle 123 coaxial and embed and be fixed in the right side wall of cylinder head 33 by seal ring parts 128 with above-mentioned camshaft 53, the left end of pump live axle 123 is embedded into and directly is incorporated into the embedding hole that wears in the right side of camshaft 53, with coaxial rotation integratedly.
The right opening of the 121b of short cylinder portion of the pump housing 121 is covered, and the water pump cover 122 that the 121b of short cylinder portion and impeller 124 are accommodated is together overlapped the open end of the 121b of short cylinder portion.
Periphery at the 121b of short cylinder portion of water pump cover 122 forms bolt hole 121h everywhere, and is corresponding with the bolt hole 121h of the pump housing 121 on water pump cover 122, also forms bolt hole 122h everywhere.
As shown in Figure 8, the bolt hole 121h that is positioned near the pump housing 121 the top of cylinder head cover 34 carves and is provided with female thread, the bolt 129a that connects the bolt hole 122h of corresponding water pump cover 122 is screwed together in bolt hole 121h and both are linked.
And, the bolt hole 121h of other three place, 122h are as shown in Figure 7, overlapping with the installation hub portion 33b of cylinder head 33 corresponding formation, bolt 129b in-and-out bolt hole 122h, 121h, be screwed together in the female threaded hole that hub portion 33b is installed, at cylinder head 33 pump housing 121 and water pump cover 122 are linked together, water pump 120 is installed on cylinder head 33.
In addition, for water pump cover 122, water sucks the tube 122b of portion from prolonging towards the direction of bent axle 40 along the right flank of cylinder head 33 to the suction oral area 122a of the right side of water pump live axle 123 bulging, simultaneously, ejection port portion 122c extends to oblique downside in the wiring direction from the bottom of the outside of impeller 124, as Figure 11 and shown in Figure 12, from the also outstanding ejection connecting tube 126 that is provided with of ejection port portion 122c.
In addition, be formed with the 122d of venting portion, go up the side-prominent venting connecting tube 127 that is provided with to oblique back from the 122d of venting portion on the top of the outside of impeller 124.
As mentioned above, cylinder head 33 is provided with decompressor 100 and water pump 120.
With respect to the cam sprocket wheel 54 that is fixed on camshaft 53 at the end hitch pump live axle 123 of axle direction and the camshaft 53 of decompression counterweight 101 opposition sides and set water pump 120, therefore, the decompression counterweight 101 and the water pump 120 of swing are positioned at opposition side with respect to cam sprocket wheel 54 each other at axle direction, need not consider each other interference and devices spaced apart, therefore, water pump 120 can be set compactly and the miniaturization of realization cylinder head 33 on camshaft 53.
This decompressor 100 is along the side decompression of the single armed axle supporting swingably counterweight 101 of exhaust cam 53e, therefore, do not need the shaft supporting part under the situation of two arm axles supportings, thereby can be with axle direction width compactness, and because decompression counterweight 101 is held and is positioned between the packing ring 108 and exhaust cam 53e of the block bearing 53b of camshaft 53 butt, therefore, can prevent to reduce pressure rocking of counterweight 101 and the action of keeping decompressor 100 well.
In this decompressor 120, the pump housing 121 made be used for rotating via bearing 125 that ground axle suspension pump live axle 123 is cylindric freely, can realize miniaturization, this pump housing 121 cylindraceous is embedded into and is supported on the sidewall of cylinder head 33, therefore, water pump 120 can be installed on cylinder head 33 compactly.
Claims (5)
1, a kind of valve structure of internal-combustion engine, it possesses: the camshaft that is driven in rotation via the rotation of cam chain transmission bent axle; Carry out the engine valve of on-off action by the valve cam that is arranged at this camshaft; During compression stroke during startup, the decompressor that described engine valve is opened, the valve structure of described internal-combustion engine be characterised in that,
Make camming surface at described valve cam haunt relief cam action freely the decompression counterweight by centrifugal force swingably axle be supported near the end or an end of described camshaft,
End at the described camshaft of axle direction and described decompression counterweight opposition side is equipped with water pump.
2, the valve structure of internal-combustion engine as claimed in claim 1 is characterized in that,
Described decompression counterweight is passed through supporting axle and the supporting of coverlet arm axle swingably along the side of exhaust cam in the described valve cam,
Described decompression counterweight be held and be positioned at and the packing ring and described exhaust cam of the block bearing butt of described camshaft between.
3, the valve structure of internal-combustion engine as claimed in claim 1 or 2 is characterized in that,
Described decompression counterweight is disposed in the width of the cylinder sleeve on the axle direction of described camshaft.
4, as the valve structure of each described internal-combustion engine in the claim 1～3, wherein,
Described decompression counterweight is across cylinder axis and at the opposition side of cam sprocket wheel and in the front-end configuration of inserting logical direction of described camshaft.
5, as the valve structure of each described internal-combustion engine in the claim 1～4, it is characterized in that,
Described water pump rotate the sidewall that the pump housing cylindraceous was embedded into and was supported on cylinder head that makes of ground axle suspension pump live axle freely via bearing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008033797A JP4933463B2 (en) | 2008-02-14 | 2008-02-14 | Single cylinder 4-stroke internal combustion engine |
| JP2008033797 | 2008-02-14 | ||
| JP2008-033797 | 2008-02-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101509405A true CN101509405A (en) | 2009-08-19 |
| CN101509405B CN101509405B (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100038991A Active CN101509405B (en) | 2008-02-14 | 2009-02-12 | Valve structure of internal combustion engine |
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| Country | Link |
|---|---|
| JP (1) | JP4933463B2 (en) |
| CN (1) | CN101509405B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044425A (en) * | 2016-12-30 | 2017-08-15 | 江苏万伏新能源有限公司 | A kind of electric water pump |
| CN107575274A (en) * | 2016-07-05 | 2018-01-12 | 铃木株式会社 | Variable valve actuator for air, engine and automatic two-wheeled cycle |
| CN117441055A (en) * | 2021-05-29 | 2024-01-23 | 伊顿智能动力有限公司 | Pivot bracket assembly, actuator assembly and valve mechanism |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5905665B2 (en) * | 2011-02-08 | 2016-04-20 | 本田技研工業株式会社 | Rocker arm equipment |
| JP5703097B2 (en) * | 2011-03-31 | 2015-04-15 | 本田技研工業株式会社 | Drainage structure from cooling water pump in vehicle engine |
| CN102588032B (en) * | 2012-02-17 | 2013-10-09 | 隆鑫通用动力股份有限公司 | Pressure reduction mechanism for air distribution cam shaft of diesel engine |
| JP6069765B2 (en) * | 2013-09-30 | 2017-02-01 | 本田技研工業株式会社 | Variable valve operating system for internal combustion engine for saddle riding type vehicle |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60243313A (en) * | 1984-05-18 | 1985-12-03 | Honda Motor Co Ltd | Engine decompression device |
| JPH0235926A (en) * | 1988-07-26 | 1990-02-06 | Mitsubishi Electric Corp | Apparatus for automatic adjustment of viscosity |
| JP2649179B2 (en) * | 1988-12-30 | 1997-09-03 | ヤマハ発動機株式会社 | Air-liquid cooling engine |
| JP2890218B2 (en) * | 1991-09-27 | 1999-05-10 | 本田技研工業株式会社 | 4-cycle engine with decompression device |
| JP2002122012A (en) * | 2000-10-13 | 2002-04-26 | Fuji Heavy Ind Ltd | Decompression device for engine |
| JP4042955B2 (en) * | 2002-02-06 | 2008-02-06 | 本田技研工業株式会社 | Internal combustion engine having decompression means |
| CN2536790Y (en) * | 2002-04-01 | 2003-02-19 | 财团法人工业技术研究院 | Engine cooling water pump installing mechanism |
| US6796294B2 (en) * | 2003-01-17 | 2004-09-28 | Honda Motor Co., Ltd. | Internal combustion engine |
| JP4083026B2 (en) * | 2003-01-17 | 2008-04-30 | 本田技研工業株式会社 | Internal combustion engine |
| US6868835B2 (en) * | 2003-01-17 | 2005-03-22 | Honda Motor Co., Ltd. | Internal combustion engine |
| JP4498256B2 (en) * | 2005-06-27 | 2010-07-07 | 本田技研工業株式会社 | Decompression device for internal combustion engine |
-
2008
- 2008-02-14 JP JP2008033797A patent/JP4933463B2/en not_active Expired - Fee Related
-
2009
- 2009-02-12 CN CN2009100038991A patent/CN101509405B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575274A (en) * | 2016-07-05 | 2018-01-12 | 铃木株式会社 | Variable valve actuator for air, engine and automatic two-wheeled cycle |
| CN107575274B (en) * | 2016-07-05 | 2020-02-07 | 铃木株式会社 | Variable valve mechanism, engine, and motorcycle |
| CN107044425A (en) * | 2016-12-30 | 2017-08-15 | 江苏万伏新能源有限公司 | A kind of electric water pump |
| CN107044425B (en) * | 2016-12-30 | 2023-08-08 | 常州腾龙汽车节能科技有限公司 | Electric water pump |
| CN117441055A (en) * | 2021-05-29 | 2024-01-23 | 伊顿智能动力有限公司 | Pivot bracket assembly, actuator assembly and valve mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4933463B2 (en) | 2012-05-16 |
| CN101509405B (en) | 2012-08-29 |
| JP2009191748A (en) | 2009-08-27 |
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